Dumfries and Galloway · Scotland
Sand mastic for sash & case windows in Gelston, Dumfries and Galloway
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Gelston and across Dumfries and Galloway. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Open joints round the window box
- Tired mastic found when preparing windows for paint
- Cement or filler used on old window joints that has cracked
Sand mastic for homes and businesses in Gelston
Burnt sand mastic is a traditional material that sits naturally against stone and brick. It’s a good fit for period properties, where modern sealant can look out of place. We are often asked to deal with a silicone bead on a sash window that spoils the look and wind and rain getting in round a sash window, across stone surrounds, brick reveals and period & listed homes.
Mastic can only go onto a dry joint, so outside work in Gelston depends on the weather, and longer journeys are planned in advance. Tell us about access to all the windows and doors, upstairs included.
Big or small, you get the same one-year guarantee.
- Where
- Gelston (DG7)
- Wider area
- Dumfries and Galloway
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Landlord and commercial work in Gelston
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Leave it or put it right?
New sash windows are a major, costly change, and in listed buildings it may need consent. If the frames are sound, renewing the mastic deals with gaps and draughts at the surround. Out of town in Scotland, exposed walls take a lot of weather, and once water gets behind a failed joint, damp in stone or harled walls is slow to dry out.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will explain what it covers.
Why choose Mr Mastic in Gelston
- We never seal over old sealant
- Experience in homes, commercial sites and hotels
- Fully insured
- Anti-fungal sanitary silicone in wet areas
See what affects the cost and our reviews.
Different surfaces, different methods
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.
Brick reveals
Brick reveals round timber windows are often pointed with sand mastic. It suits older brickwork.
Gelston: your questions answered
Is Gelston in your area for sand mastic?
Yes, Gelston is within the area we cover. We work across all of Scotland. You can email us at info@mrmastic.co.uk and let us know what needs doing.
Is there a guarantee on sand mastic in Gelston?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Can you seal over the old sealant?
No, it will not last. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
What information do you need?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Are you insured?
Yes. We’re fully insured, and we’ve been doing sealant work for more than 20 years.
How long does sand mastic take?
A typical job takes a few hours for a single window, longer for several, including preparation and clearing up. We will confirm how long when we quote.
Can old silicone round a sash window be swapped for sand mastic?
In most cases. We remove the silicone and clean the joint before the sand mastic goes in.
What is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and finished to sit neatly against the masonry.
What sand mastic looks like in Gelston
Many older homes in Scotland have sash and case windows, often pointed into the wall with traditional sand mastic. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that.
In and around Gelston, as anywhere, good sand mastic starts with a clean, dry, properly prepared joint.
Gelston is about 17 miles south-west of Dumfries, in Dumfries and Galloway. For sand mastic in and around Gelston, please email us at info@mrmastic.co.uk for a quick quote. We cover Dumfries and Galloway from our Crawley base. Gelston is one of 138 towns and villages in Dumfries and Galloway we cover. Our Glasgow page covers work nearby, about 67 miles away.
Here we cover the DG7 postcode area for sand mastic. That includes homes and businesses on Douglas Terrace and Douglas Crescent and the roads around them. If you’re just outside Gelston, we cover Kelton Hill (2 miles west), Castle Douglas (2 miles north), Bridge of Dee (2 miles west), Palnackie (3 miles east) and Dalbeattie (4 miles north-east).
Around Gelston
Nearby you’ll also find Gelston Castle (0.5 miles east) and Castle Douglas Art Gallery (2.4 miles north). The countryside around Gelston includes Carlingwark Loch.
When it isn’t the sealant
Before booking, it’s worth knowing the limits:
- Masonry that needs repairing
- Rotten sashes, sills or window boxes (a joiner’s job)
- Planning or listed building consent (your local planning authority decides)
If you’re not sure, just email us at info@mrmastic.co.uk and we’ll give you a straight answer.
Where we work in Gelston
- Tenement windows
- Timber door frames
- Period & listed homes
- Stone surrounds
- Brick reveals
- Sash and case windows
What we do, step by step
The work is kept neat and contained to the joints we are treating, so you can get on with your day. Expect the work to take a few hours for a single window, longer for several, and we explain the cure time before we leave. Outdoor work around Gelston depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Indoor work goes ahead whatever the weather.
- First, we look at the surrounds with you and agree what needs doing.
- We rake out the old mastic and clean the joint.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Before we arrive
- Keep pets and children clear of the area while we work
- Clear items away from the joints we’re working on
- Tell us about any water getting in
How to get a quote
To get a quote, email us at info@mrmastic.co.uk with the location and a short description of the problem. You will have a clear quote before work begins.
Read more
What affects the cost of sand mastic
We quote each job individually. This is what makes a difference:
- The number and length of the joints
- Whether the work is at height
- Working hours on commercial sites
- Any mould that needs treating
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What we need to know
Before you ask for a quote, have a think about:
- If it’s domestic, commercial or a hotel
- The address or postcode of the job
- Pictures of the joints, sent by email
- What the problem is, such as mould, gaps, leaks or cracking
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Signs you need sand mastic in Gelston
Rain on the window surround works into any crack and loosens it further. Windows facing the weather tend to go first.
Common reasons people contact us include:
- Tired mastic found when preparing windows for paint
- Wind and rain getting in round a sash window
- Cement or filler used on old window joints that has cracked
- Gaps round a timber door in stone or brick
In the older streets around Kirkland Of Gelston, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- Which colour the sealant will be
- Is VAT in the price?
- Whether they seal over old material or remove it
- The length of the guarantee